161636408 has 32 divisors (see below), whose sum is σ = 321732000. Its totient is φ = 75866112.

The previous prime is 161636407. The next prime is 161636411. The reversal of 161636408 is 804636161.

It is a super-2 number, since 2×161636408² = 52252656782284928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161636407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59741 + ... + 62387.

It is an arithmetic number, because the mean of its divisors is an integer number (10054125).

Almost surely, 2^161636408 is an apocalyptic number.

It is an amenable number.

161636408 is a deficient number, since it is larger than the sum of its proper divisors (160095592).

161636408 is a wasteful number, since it uses less digits than its factorization.

161636408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119 (or 3115 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 161636408 is about 12713.6307953314. The cubic root of 161636408 is about 544.7280387068.

The spelling of 161636408 in words is "one hundred sixty-one million, six hundred thirty-six thousand, four hundred eight".